new harddrive degraded speed

[brainfart@posteo.net]

i bought a new harddrive
western digital red plus 6tb

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD60EFRX-68L0BN1
Serial Number:    WD-WX62D60C9L6X
LU WWN Device Id: 5 0014ee 212e6b9ad
Firmware Version: 82.00A82
User Capacity:    6,001,175,126,016 bytes [6.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5700 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Wed Jan 20 17:12:52 2021 CST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

why is the speed 3.0 gbs
i have 4 other drive i have tested with this device and they all  use 
6.0 gbs